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18477 (1995 WA11)
Classification: Main-belt Asteroid          SPK-ID: 2018477
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2171137661134789 4.005e-08  
a 3.16315605784297 2.1713e-08 au
q 2.476391333320017 1.3489e-07 au
i 10.45718943402155 4.7226e-06 deg
node 54.74129705965044 2.6079e-05 deg
peri 259.1078300238518 2.8366e-05 deg
M 269.619679477014 1.2852e-05 deg
tp 2459912.382423688867
(2022-Nov-28.88242369)
7.4956e-05 TDB
period 2054.846358735353
5.63
2.1158e-05
5.793e-08
d
yr
n .1751955801802917 1.8039e-09 deg/d
Q 3.849920782365922 2.6428e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1213  
   data-arc span      9338 days (25.57 yr)  
   first obs. used      1995-11-14  
   last obs. used      2021-06-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53612  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:33:50  

Additional Information
 Earth MOID = 1.48875 au 
 Jupiter MOID = 1.59888 au 
 T_jup = 3.142 
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Orbital Elements at Epoch 2457342.5 (2015-Nov-16.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2156911812562001 3.9978e-08  
q 2.482373761985985 1.3433e-07 au
tp 2457854.554211009315
(2017-Apr-11.05421101)
7.1324e-05 TDB
node 54.78344644187876 2.6074e-05 deg
peri 258.7943046916297 2.8395e-05 deg
i 10.45523672750894 4.7211e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1213  
   data-arc span      9338 days (25.57 yr)  
   first obs. used      1995-11-14  
   last obs. used      2021-06-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53612  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:33:50  

Additional Information
 Jupiter MOID = 1.59888 au 
 T_jup = 3.142 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.598245038215936E-15 -5.335435562271458E-15 9.562909781876614E-13 7.24911398825227E-15 1.821160592558414E-13 -1.733026774823482E-15
q -5.335435562271458E-15 1.804557616875151E-14 -2.946882391189092E-12 -4.644265249024175E-14 -5.634665196968961E-13 1.268226878547955E-14
tp 9.562909781876614E-13 -2.946882391189092E-12 5.087165246336779E-9 1.430469514194559E-11 8.356583869974603E-10 -7.226493914950138E-13
node 7.24911398825227E-15 -4.644265249024175E-14 1.430469514194559E-11 6.79869661710526E-10 -6.663966458230594E-10 -5.395443475473482E-11
peri 1.821160592558414E-13 -5.634665196968961E-13 8.356583869974603E-10 -6.663966458230594E-10 8.06268345762085E-10 5.307037942811194E-11
i -1.733026774823482E-15 1.268226878547955E-14 -7.226493914950138E-13 -5.395443475473482E-11 5.307037942811194E-11 2.228919379475122E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.17   n/a MPO636342  
diameter diameter 10.900 km 0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.045   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18477 (1995 WA11)          Discovered 1995-Nov-16 by Spacewatch at Kitt Peak
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1995 WA11 = 1999 JK45 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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